Genotypic differences in physiological and biochemical responses to salinity stress in melon ( Cucumis melo L.) plants: Prospects for selection of salt tolerant landraces

Varietal differences in physiological and biochemical responses to salinity stress in six finger millet plants

“…In our study, the concentration of Cl - in leaves was higher than that of Na + and this may be justified by the partial control of Na +, at roots. Comparable results were also exhibited by melon (Sarabi et al, 2017) and cucumber (Colla et al, 2012).…”

“…The observed reduction of leaf area under salinity treatments compared to control plants also suggests that salinity stress may affect plant growth through reduction in leaf area. Previous works have disclosed that salt tolerant plants displays less growth retardation and have relatively higher growth rate compared to sensitive ones under salinity stress (Carillo et al, 2019; Hussain et al, 2018; Sarabi et al, 2017;). Consequently, our findings suggest that GBK043128 and GBK043137 have a better capacity to sustain growth and development under salt treatments compared to other finger millet varieties studied, to sustain growth and production under salinity conditions (Table 2).…”

“…Accumulation of ions in plant tissues is regularly used to evaluate the capability of a plant to resist salt stress and salinity is known to cause fluctuations of macronutrients. The concentration of sodium, potassium and calcium ions and the K/Na ratio are vital features that usually used for screening of salt tolerant plants (Sarabi et al, 2017). We used leaf tissues because they are more sensitive to salt and start displaying toxicity much earlier compared to other plant organs (Munns and Tester, 2008).…”

“…It has been established that Na + and K + have similar cellular effects despite the fact Na + inhibits K + absorption through binding and obstructing to its transport system (Flowers and Yeo (1986). Many studies have reported that plants growing under high NaCl concentrations have low ratios of K + /Na + ratio caused by deficiency of intracellular K + (Dugasa et al, 2018; Cirillo et al, 2018; Sandhu et al, 2017; Sarabi et al, 2017). The same phenomenon was also observed in this study, where increment of NaCl concentration decreased the leaf K + /Na + ratios.…”

“…The resistance and response of plants to a salt stress varies according to its species or varieties or genotypes or variety and environment which could be attributed to the biological dissimilarities between the species or varieties or genotypes, plant growth, and composition and concentration of the salt stress conditions (Bertazzini et al, 2018; Filichkin et al, 2018; Shabala et al, 2013). Many reports have shown that short term salinity stress significantly affects the germination rate, seedling and root growth as well as ion composition, levels of relative water content, photosynthetic pigments, proline content, level of membrane lipid peroxidation as well as the amounts of reducing sugars and total protein (Dugasa et al, 2019; Sarabi et al, 2017; Kumar and Khare, 2016). These physiological and biochemical indices multivariate cluster analysis been used for classification of salt-sensitive and salt-tolerant varieties so that they can further be used in plant breeding programmes.…”